I get a lot of these. I have had to learn a new vocabulary

"mochi !"  - mochiron
"omoroi !" -  omoshiroi
"chou omoroi" (etc)
"shikutta" - I screwed up
"hoi ja" - see you later
"be-bai" - bye bye
"ko-wa" - kowai
"shi'nai" - shiranai
"yokukunai?" - "ii ja nai?"
"kachoi !"  - kakkoi